Collapsible filler



Oct. 19, 1943. p, ZALKIND 2,332,287

GOLLAPSIBLE FILLER Original Filed April 20; 1936 S Sheets-Sheet l INVENTOR BY v Q ATT RNEY Oct. 19, 1943. P. ZALKIND COLLAPSIBLE :ILrLE R Original Filed April 20. 1936 3 Sheets-Sheet 2 R o T E V N ATTORNEY Oct. 19, 1943. P. ZALKIND COLLAPSIBLE FILLER Original Filed April 20, 1936 3,Sheets-Sheet 3 INVENTOR ATTORN-EY Patented Oct. 19, 1943 UNlTEDTfS -TATES EATENT OFFICE I v I 2,332,287

COLLAPISIBLE FILLER a Philip Zalkind, New York, N. Y. Original application April 20, 1936, Serial No. if 75,314. Divided and this application February 12, 1941, Serial No. 378,535 a a 2 Claims. (01. 229 -14) This application is adivision of application Ser. No. 75,314 filed April 20, 1936, and relates to novel heat insulation members, and more particularly to collapsible members of sheet material adapt able for use with casings, wherein it is desired to control or maintaintemperature, and exclude or conserve heat.

My invention comprises novel combinations of simple fo'rmsof sheet material, such as corru gated board, straw board, box board, paper, metal foil, paper backed foil and the like, by which I obtain a collapsible structure, which when expanded produce one or more dead air, spaces to act as insulation. By this means-transfer of heat is-so effectively reduced that a casing with this insulation may be used in the transportation, and/or storing of such materials as ice-cream.

As will be clearly shown later -herein my novel insulating member may be formed" from a few simple fundamental shapes,-which may be, united in various combinationsto form collapsible insulating units, which may by themselves be used as insulating'fillers'in a suitably constructed casing, as, for instance, thecasings shown in my tended for insulating service. By the use of my 1;. insulating form, as will be clearly shown, these common shipping containers become adapted to the shipment of substances which must be maintained at temperatures appreciably diiferent from that of the atmosphere, 7 h

Allof the'various fundamentalseotions enter inginto my construction, as 'well as the composite sheets or units which Iform by various combinations of these -rfundamental sections, are easily and quickly produced. The fundamental sections are several shapes of scored blanks, or

simple rectangular tubes which may be manu-.

factured according to present common practice. Also various forms of my insulating. sheets may be made quiokly'andcheaply in a continuous process as I showin my copending application entitled Method'of producing insulation sections, Ser'. No. 75,318, and fined coincidently with the parent application.

bjects of my invention are thus to provide a collapsible insulating filler for casings, which filler may be expanded to form fdead air spaces having a high heat insulating value. Other objects of my invention are to provide an insulating filler that is of low cost, that is simple and'easv section, such as I use in the construction of my insulation.

Q Figure 2 isa fragmentaryper'spective view of another of the fundamental shapes of Zshaped cross-section.

Figure 3 is a fragmentary perspective view showing one form of my insulating sheet as formed by uniting two sheets, each having the general form of the fundamental shape shown in Figure 1. v a a Figure 4 is a fragmentary perspective view showing a modified form of my insulating sheet similar to that shown in Figure 3, except that it is formed from three sheets of the general form shown in Figure 1. v V

Figure 5 is a fragmentary perspective view similar to Figure 3, except that the insulating sheet is formed by uniting one sheet having th general form ofthe fundamental shapeshown in-Figure 1, and one sheet having the general form of the fundamental shape. shown in Figure 2.v

Figure 6 is, airagmentary perspective view similar to Figure 3, except that in Figure 6 the position of one sheet is reversed with respect to the other. k

' Figure 7 is va fragmentary perspective view similar to Figure 6, except that in Figure? the two outstanding legs on onev of the fundamental sec tions are of different lengths.

Figure 8 is a fragmentary perspecitve View of z, a form of insulating member having the same general'outline as the member shown in Figure 7, but formed from a single sheet of material. I Figure 9 is a fragmentary perspective View of a form of insulating member similar to that shown in Fig. 8, but not provided with an outstanding flange.

Figure 10 is a fragmentary perspective view showing a form of my insulating sheet built up from a plurality of fundamental sections similar to that shown in Figure l, and reinforced with a plurality of sections similar to the fundamental form shown in Figure 2.

Figure a is a fragmentary end view of the form of insulating unit shown in Figure 10 after the unit has been collapsed in one direction.

Figure 1% is a fragmentary end view similar to Figure 10a showing the insulating unit collapsed in the other direction.

Figure 100 is an enlarged sectional view through one of the spacer members of Figure 10 showing a modified form of construction.

Figure 11 is a fragmentary perspective view showing a rectangular unitary insulating struc-. ture inserted within a rectangular casing.

Figure 12 is a fragmentary perspective-view showing the insulating structure of Figure II in partially collapsed condition.

Figure 13 is a fragmentary perspective view showing a rectangular casing completely insulated with my novel sections.

Figure 14 shows a developed blank for formin the casing of Figure 13. I

Figure 15 is a, fragmentary perspective view showing one of the unitary insulating members shown in place within the casing of Figure 13.

'Figure 16 isa developed blank for forming one of the end seals shown in Figure 13. I

Figure 17 is a fragmentary perspective view showing a spacing member as is shown in Figure 13.

Figure 18 is a fragmentary perspective view shcwingmy insulating sections interposed within the air space of one form of my insulating casing.

In Figure 1 I have shown one of the fundamental shapes that I use to form my novel insulating sheets. As shown, this shape is formed from a single sheet of material having the score lines I and 2. The sheet is bent on these score line to form a channel having the Web 3 and the flanges 4 and 5.

In Figure 2 I have shown another one of the fundamental shapes that I use to form my novel insulating units. This form is similar to that shown in Figure 1, except that one of the flanges is bent in the opposite direction from that of the other flange, thus forming a Z shaped section having the web 3 and the flanges 4 and I. It will be noted Figure 1 and 2 are substantially alike, except that score line 6 in Figure 2 is pr-eferably on the opposite side of the sheet from score line I; while in Figure 1 both score lines are preferably on the same side of the sheet. This facilitates bending the flanges into their intended directions; the arrangement and character of scores will vary with various'material conditions according to practices well known in the art.

In Figure 3 there is shown aninsulating sec-. tion formed from two fundamental sections having the same general shape as the section shown in Figure 1.. Member 8 is united with member 9, preferably by the glue lines I!) and H, the flange l2 of member 8 being secured to the longer flange 13 of member 9 by the glue line It, and the flange M of member 8 being secured to the longer flange H? of the members by the glue ,line H,

/ Flanges l2 and M are shown to, be of practically the same length as each other. Flanges I3; and K5 are likewise of equal-length toeach other. An air space 18 is formed, between the web I6 of member 8 and the web ll of'member 9. Also, when the edges of the flanges are laid against a flat surface, an additional air space; is formed between that surface, the flanges and the web I6, The materials of sheets 8 and 9 forming the section will depend upon the particular use to which the insulating sheet is to be put. Thus, as an example, sheet 9 may be of relatively strong and heavy material, such as corrugated board,

while sheet 8 is of lighter material, such, for example, as chip board, box board, or paper. It will,

of course, be understood that both sheets may be formed from the same kind of stock, and that other materials may be used than those specifically mentionedabove.

In Figure 4 I have shown a modified form of insulating section utilizing three of the fundamental sections of Figure 1 united with two plain strips of sheet material. Thus flanges 4 are united with the sheet [9 by the glue strips 2!, and flanges 2 are united with the sheet 20 by the glue strips 22. In this manner an insulating unit is formed having the two air spaces 23 and 24, and capable of forming an additional air space when the edges of the flanges are placed against a flat surface, as has been explained in connection with Figure 3. It will be noted that while the figure shows three sections similar to those of Figure 1 united withthe plain sheets, any number of such sections may be so united, and the number of air spaces so formed willbe one less than the number of channel shaped sheets used in the construction. However, in coaction with a container wall the number of air spaces equals the number of sheets, as will be shown later. In thismanner the insulating properties of the unit may be varied at will, more air spaces being provided where higher insulating values are needed, I

In Figure 5 I have shown a form of insulating unit'using one sheet 9 havingthe shape of that shown in Figure 1, and a second sheet 25 having the shape of that shown in Figure 2. As shown, sheet 9' and sheet 25 are united by means of their flanges. Ihecombined unit so formed includes an insulating air space, and the unit has the same general form as that shown in Figure 3 produced from two channel shaped members.

Another similar form is also shown in Figure 6. Like Figure 3, the form shown in Figure 6 is produced from two channel shaped members. However, while the flanges 12 and M of the inner member of Figure 3: are turned in the, same direction as are the flanges I3 and I5. of the outer member; as shown'in Figure 6, the flanges I2 and M are turned in: the opposite direction to the flanges I3 and i5. The form of. Figures 3, 5 and 6 may be used interchangeably as insulating units, as well as in combinations formingmore complex insulating structures in a manner to be later described, as in each case for the same dimensions equivalent air space 18, equivalent insulating effect and equivalent collapsibility will be secured. The forms shown in Figures 3 and 6 are readily assembled in a continuous manner using the method and apparatus of my copending applicationi-to the parent application) previously referred to. However, if the parts are manually secured to each other, the form shown in Figure 6 is somewhat more easily made than the form of unit shown-in Figure 3. ThusQi-n manually combining the form of unit shown in Figure 6, flange 13 may be first bent out of the plane of the web 11. This forms an angle which acts as an automatic stop in positioning flange [2. Flange l2 may be bent out ofthe plane of web 16 and have glue applied thereto. It may be then pushed into position against flangel3. When the freeedge of flange [2 comes into abutting relationship with the angle formed by flange l3 and web H, then attached to sheet 35,

face of'web It. It willb ifurther understood that both flanges mayend flush, so that the section formed-is substantially. rectangular in cross-section; The preferred length of flange will ineach instance depend upon the particulariapplication material used, and specific method of assembling and-combining the units.

Where a, section, such as that shown in Fig-- ure 7, is desired, andwhere the requirements of the unit is such that material of substantially uniform quality. and thickness may be used, the unit may be formed from, a single sheet of material as is shown in Figure. 8. Theair space It is formed between the webs 21 and28 and the,

ends 2!! and 3d. The endf3i] extends beyond the web '28 in the same-manner as flange: itextends beyond web i6 in Figure '7. As is shown inFigure 8 the two ends of the sheet are united through glue flap ill on web .28, and flange 30 on Web i 7 I Figure 9 is similar to Figure 8, except that no extended flange is provided in Figure 9, and that the two ends of the sheet are united with each other through the 'fiap 32 attached to the end flange 33. Flap 32 is positioned to be pasted to the free edge of web 2l.- This form'is particularly adaptable to a member which i provided with end scoring to produce an additional fold. In the structures shown in Figures 8 and 9 the unit formed is, of course, of material or sub stantially uniform quality and thickness, as each is formed from a single sheet ofmaterial. Where in a form, such as is shown in Figures 3 and 5, the requirements of the particular adaptation are such that material or" substantially uniform quality and thickness may be used, these forms may, like Figures 8 and 9, be formed from a single sheet of material. Thus, for instance, in Fig. flange 4 and flange! 3 may be joined to each other at their extremities, the unit thus being formed from a continuous sheet of material.

In Figure 10 I have shown an insulating unit having two air spaces 34' and 35 parallel with the surface of the sheets forming the section. As

shown the principal members of the section are the channel shaped sheets of Figure 1. One sheet 36 has its flanges 31 and 38 turned outwardly,

ture, including the braces, may 'be flattened, and the various partsmay swing on the score lines, as may easilybejseen, and as is more fully explained in connection. with Figures 10a, 10b, and

-10c.':- Members39-and 40, in addition to bracing thediaphragms, also serve to subdivide the air spaces 3.4 and35, and so act toreduce any possible convection currents within these spaces.

-In' collapsing the structure of Figure 10 the parallel diaphragms may. be moved in either directionwithrespect to each other. Ihus, if

, it is assumed that the outer membrane 36 is held stationary, if the-inner membrane. is displaced to .'the left, the unit will 'fold with each spacer member doubled back upon .itself, as shown in Figure 1012; if; the inner membrane is displaced to theright, theunit will fold with each spacer flattened out, as shown in Figurelilb. Inmaking up :the unit, I prefer that the spacers be folded, as shown inv Figure lOaas with the spacer *so folded, any glue improperly applied in the gluing and the other two sheets have their flanges 4 and y 5 turned inwardly in the same manner as is shown in Figure 6. On airspace 34 is formed between sheet 36 and the inner diaphragm 3. ,The' other air space is iormed between the two diaphragms 3. In order to brace the diaphragms, the Z sections k tions are similar in shap to the form shown'in' Figure 2. One flange of each of the ,braces39 is and the other flange is at tached to the inner diaphragm 3. One of the flanges of each of the braces is attached to the inner diaphragm 3, and the other flange is attached to the outer diaphragm. With this construction, while the diaphragms are adeg quately braced, and so, be maintained inpredetermined spacings, even though made of easily collapsible, as

39 and ii! are provided. The sec operation does not act to prevent expansion of the section. Also with the spacers folded as in Figure 10a, the expansion of the unit is somewhat easier than when the unit. is collapsed, as is shown, inFigure 10b, as the elasticity of the spacer units tends to. expand the unit with this folding when .eachspacer is a single .piece of material. However, with the method of folding, as shown in Figure 10b, the unit will occupy less volume. in-the collapsed state than when folded, asshown in Figure 10a.. However, with the construction of spacers, as shown in Figure 1G9, this difierence involume will not be appreciable.

- :In Figure 100, the spacer t9 isshown as being formed from two separate sheets of material. One sheet 39a; of cardboard, corrugated board or similar sheet serves as the proper spacer. Secured to this is the sheet of paper 3% having the extensions 39c-and 39d which serve tounite the spaoer with. the adjacentadiaphragms. Thus, as shown, extension 390 serves to unite'the spacer with sheet 36, and-extension 38d serves to unite the spacer with sheet 3; i

.In vtheJconstructionof an insulatin section, such asis shown in Figure 10, not only may the various partsibe of different thicknesses, but. also various construction material may enter into the tive insulation against radiated heat. This application of radiating surfaces maybe used with other. modifications .of my collapsible insulating section. 1 It will be noted where the spacing mem- .bers, such as 39 and 4d of Figure '10, are used in connection with the diaphragms 3 constructed of metal foil, that these spacing members act to support. thefoil and maintain the diaphragm in a substantially plane surface.

' It will be :noted thatv the shapes. shown in Figures 1, 2, Band 9 are formed from asingle sheet of material,;an d with various dimensions are the fundamental shapes from which my insulating units and other structures may be made. These sheets and structures maycomprise various combinations depending ,upon the purpose and the particular-application forwhich it is intended. Thus in Figures 3,5, 6, and I show an insulating sheet of simple form comprising only two'sepa rated members united with each other. In Figures 4 and a fuller arrangement of parts is shown to produce an insulating unit. Other arrangements of the parts may be assembled as will readily suggest themselves fromthe foregoing. As will now be obvious, various forms .of sheets may be combined with each other to produce other forms of insulating units, or'to produce complete insulating structures which,'-for most applications, are preferably of quadrilateral form.

In Figure 11 I have shown a modified form of structure, in this case formed from the insulating units shown in Figure 4. Thus, one of such insulating units is represented by the two end panels Mia and a and the three diaphragms HlSa, lflla and 105a. This makes. up one of the sides of the quadrilateral form. The other sides are made up of similar parts. One has the end members I92) and 20b with diaphragms I031), 10322 and 1052); another has the end members 190 and Ma with diaphragms I030, [M0, and H150; and a fourth has the end members. Md and 20d with the diaphragms l03d, [Md and 15d.

As shown, the four insulating wall members are united with each other'through one o1 the end members on each wall, neither being secured to the inner diaphragm on the adjacent wall member in any suitable manner. Thus as shown,

the end member Ha of one unit is secured to the diaphragm 103D of the adjacent wall member. The end member l9b at the opposite end of the diaphragm M31) is in turn secured to the diaphragm i030 of the next adjacent section; end member [90 is secured to diaphragm Nd; and end member [9d is secured to diaphragm H7311, thus completing the quadrilateral.

As will be seen from the figure, when this structure is placed in the casing shown as having the sides T9, 80, 8!, and 82, 18 and 82 being united with each other by the tape I05, there are formed three separate air spaces at each side of the casing, through which heat would have to travel in series from as into the centre space M1. A very high degree of insulation is thus secured. It is readily apparent, also that I may easily increase the efiiciency of the insulation by merely adding a further number of diaphragms on the insulating sections which make up the insulating form. That this insulating form is readily collapsible is shown in Figure 12 which shows the form of Figure 11 in a partially collapsed condition.

In order to more clearly show how various forms of quadrilateral insulating structure may be used with an ordinary shipping container to provide an insulated casing, I have further illustrated my invention in Figures 26 to 30 inclusive, in which figures I have shown an application of my invention to an insulated casing particularly adapted for shipment of a cylindrical can of icecream, such as is commonly used in the ice-cream trade. I

It will be understood that a refrigerant, for instance, CO2, may be enclosed with the shipment to compensate for such relatively small leakage of heat as will occur through the walls of the casing. It will, of course; be understood that where the casing is to be used for maintaining temperatures above atmospheric, a heat generating means may be enclosed.

In Figure 14, I show a developed form for a common type of easing into which I may insert my insulating filler in a manner as shown in Fig um 13, 'The casingis a simple blank composed of the wall members 19, 8B, 8! and 82 separated from each other by the score lines 9!, 92 and 93.

The wall members have the bottom flaps 81, 88,

.- means, as by a strip of gummed tape. This is a blank from in common use.

As .shown'in Figure 13, the casing is first set up in the ordinary'manner by expanding the sides and theufolding back the bottom flaps 81, and 89, followed by folding back the bottom flaps 88 and 90, which flaps substantially meet each shown in Figure 16 are shown in Figure 13, one

at the bottom of the casing with the flanges 'formed by the flaps I I2 turned downwardly; and

one at the top of the casing with the flanges formed by the flaps I I2 turned upwardly. Both of these trays fit. snugly within casing, as is shown for the top tray which is in section.

After the bottom tray has been placed within the casing, as has been explained, one of my insulating forms is inserted Within the casing. As shown, for this particular application, I prefer to use a number of relatively short sections, which extending for the height of the casing between the upper and lower trays, are positioned from each other by the spacer members H4. The lower one of these insulating sections is shown as as quadrilateral structure formed from the insulating form shown in Figure 10. In constructing the section, flange 38a of the panel 36a is secured to the adjacent panel 3%, flange 38d 1 of the panel 38a is preferably secured 'to the adjacent panel 36a, and so around the section, in the same manner as has been described in connection with the previously described quadrilateral structures.

As shown, the insulating section of which this quadilateral structure is formed, comprises the inner members 33a to 35 which are preferably of a relatively strong material, such as corrugated board, and these panels serve as the inside of the completed shipping container. The two lines of webs 3 which form the air spaces may be of lighter material and may be braced at suitable intervals by the 2 strips 39 and 50' in th manner as has been previously described in connection with Figure 10.

After the lower insulating structure, which fits snugly within the walls 76, 8t, 8! and 82, has been set in place it has superimposed upon it the spac ing member i i l. Member 1M, which is shown in detail in Figure 1?, is a sheet of material, for instance, corrugated board, of such dimensions as to fit closely within the four walls 79, 80, 8| and 82. The centre of the member H4 is provided with'a hole- !!5 of sufiicient size to receive the ice cream can which is to be shipped in the container. This hole, will, of course, be entirely within the space bounded by the walls 36a, 35b, 35c and 35d. The solid portion of the sheet will therefore completely cover the open end of the insulating section, so as to effectivelyseal theatr spaces therein, and in this way limit such convection currents as might be set up within the air spaces. I As has previously been pointed out, the bracing Z strips spanning the air spaces also serve to limit convection currents. i After; the lower spacing sheet H4 has been set in place, a second insulating form is placed within the casing. As shown, thissection is provided with three air-spaces rather than two as shown for'the lowerin s'u'lating section. The reason for this preference will' be explained later. How ever, where desired, ,the'same' type of insulating section may be used throughout, and such insulating forms may be any of the modifications which fall within the scope of my invention. f I n Figure 15, I show the, details of 'the second insulating section shown in Figure 1,3 As will be noted, it is of the same construction as the lower insulating section, except that itis provided with three diaphragmsinsteadbf with two, as is 'shown'in the lower section Thus each sheet that comprises the section consists of a channel shaped member as the web 36) with its two flanges 31 and 38f. This channel is preferablyof corrugated board.

Attachedto this member are'the three chan' nelshaped diaphragms having. the webs 'I I5 and flanges H6 bywhich the diaphr'agms are secured to the fianges 37] and 38 The Z shaped rewisemovement of the can will thus be guarded against.

inforci ng members ll'l brace the diaphragm as I required. The complete section is obtained by arranging four similar sections to each other in the manner described for producing the lower section. That is, a flange of one unit, such as flange 38), is preferably secured to the web of i an adjacent sheet, such as 36g; and, so on around the section. .This section is inserted within the four. walls 19-82 which it fits closely as shown in the figure.

A. second spacing member H4 is next inserted within the casing. This member covers the top ends of the air spaces formed in the insulating section just below. The air spaces of this section are thus sealed at each end by a spacing member I M which limits the convection currents which may be set up in this section, just as the air spaces on the bottom insulating section were sealed oiT between the lower spacing member and the bottom tray as has been described. I

The top insulating section which is shown as exactly. similar to the bottom insulating section is then inserted. This is followed by the top tray HI. Thus the top construction is similar to the bottom construction, so that if the casing were inverted, so far as the casing and insulating lining are concerned, there would be no variation between the top and the bottom. The top flaps 83 and 85 of the casing are then turned down to I lie in a plane perpendicular to the walls 19 to 82.. Flaps 84 and 83 are then turned down to lie over the flaps 83 and S5. The casing may be sealed with the tape I l8. 1

It will be seen in the illustration that the top flaps 8385 ,form a double layer of material over the top of the package. Moreover, this double layer rests upon the edges of the upturned flanges The purpose of the greater insulation'which I I show around'the centre of the container; as I I I cornpared'to the insulation at the .two ends,, Will now be explained. It is a'commonipracticeto ship ice-cream'with solid CO2 in the" packaga'as this refrigerant "usually placed within the container at both't'he' top and"bottom. I Vitha'uni' form insulation, the" amount of *heat'xentering the compartment does not -vary greatly lengthwise or the casing; but the refrigerating medium is concentrated at th'eltwo ends. Thus the ice cream located centrally of the container from end to endof' the container attains a higher temperature than the ice-cream at the two ends of the can. Byv providing a more effective insulationcn a'central belt around the container than at the two ends, a more'uniform condition of temperature in the ice cream is secured. I

In order to further increasethe insulating efficiency of'thecentral member, and hence tofurther the'uniformity of temperature inthe icecream, certain of the sheets which comprise the central insulating member, such as the diaample, and due to the factthat the usual container with which my section will be used is of quadrilateral section. It will be understood, however, that where a triangular, pentangular, hexangular, circular, 'etc., casing is to be insulated, it is obvious that corresponding insulating forms may be used. I

In Figure 18, I have shown how my collapsible insulating unit may be used as an insulating filler for an insulating casing, such as I showin my aforementioned copending application. In this figure, I show a double walled casing having outer walls I20, 121, I22 and I23, and .inner walls I25, 126, I21 and I28 spaced from' the outer walls by the flanges I30 and Isl; As'may be seen, an insulating air space is formed between an inner wall, a corresponding outer wall and the adjacent flanges. The efiiciency of this air space may beincreased by dividing it into narrower air space. This may be simply done by inserting one of my insulating units of proper dimension in this air space. As illustrated in Figure 18, I show insulating units similar to that shown in Figure 10 inserted within the air spaces between the inner and outer walls ofthe container. It will be noted that in this illustration, the insulating sheet is composed of comparatively thin material, and it may be formed of such inexpensive sheets as thin chip board, due to the fact that the casing itself has suificient strength to withstand the mechanical stresses, and the insulating unit has merely to supply additional resistance to the passage of heat.

As shown in the Figure 18, each of the insulating units in each of the air spaces consists of the channel shapw member having the Web 35 and flanges 31 and 38, to which are secured the flanges 4 and 5 of the Webs 3; The braces 39 and 4!! brace the various Webs toeach other.

It will be further understood that other forms of my collapsible insulatingsheet may be used in the manner'just described, depending upon the particular application. Also, a suitably shaped portion of the various modifications of my'collapsible insulating sheet may be applied in the spacegl34 between the top cover I33 and the inner'closure I32. While I have described my invention for use in connection with shipping containers and similar applications, it may be used in its several modifications for other purposes as, for instance, an insulating filler for building walls, as between the joists of frame constructed building.

Throughout the foregoing specifications, a number'of various modifications of my invention have been described. The particular forms shown have been given by way of illustrationonly, as it will be apparent that many other modifications may be made without departing from the scope and spirit of my invention as expressed in the appended claims.

Now having explained my invention in a manner that it may be readily understood by one skilled in the art, I claim:

1. A collapsible insulation unit comprising a blank of relatively stiff flbrousmaterial, a body portion defined by parallel bend-line scores, hingedly connected flange portions extending from each of said scores-parallel partition sheets secured at their edges to said flanges, the junction on each flange being in substantially parallel and in predetermined spaced relation with each other, said unit when unfolded and set up for use comprising a U-shaped member with body portion, parallel flange portions, and parallel spaced partitions spanning between and secured to the innerfaces of-saidflanges. v

2. A collapsible insulation unit comprising a blank-ofrelatively stifi fibrous material, a body portion extending between parallel junction lines, hingedly .conne'cted flange portions extending from each of said junction lines, partition sheets joined at their edges to saidfiangea the junction lines on each vflangebeing in substantially parallel and in predetermined spaced relationwith each other, said unit when unfolded and set up for use comprising a U-shaped'memberwith body portion, parallel flange portions and parallel spaced partitions spanning between and secured to the inner faces of said flanges,- said flanges having a width extending beyond the junction lines-.-

PHILIP ZALKIND. 

